US7821593B2 - Blacklight module and liquid crystal display - Google Patents
Blacklight module and liquid crystal display Download PDFInfo
- Publication number
- US7821593B2 US7821593B2 US12/142,741 US14274108A US7821593B2 US 7821593 B2 US7821593 B2 US 7821593B2 US 14274108 A US14274108 A US 14274108A US 7821593 B2 US7821593 B2 US 7821593B2
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- US
- United States
- Prior art keywords
- lamp
- backlight module
- disposed
- base plate
- side wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
Definitions
- An LCD mainly includes a liquid crystal panel and a backlight module.
- the liquid crystal panel is used for displaying image
- the backlight module is used for providing enough brightness for the liquid crystal panel to display image. Therefore, the luminance provided by the backlight module and the luminance uniformity thereof will influence the display quality of the LCD.
- FIG. 1 shows a conventional backlight module and a luminance distribution diagram thereof.
- the luminance of the backlight module is distributed along an axial direction of the lamp.
- the backlight module 100 includes a frame 110 and a plurality of lamps 120 disposed in the frame 110 .
- the lamps 120 are arranged in parallel with regular intervals in the frame 110 , so as to form a surface light source with uniform luminance.
- two ends of the lamps 120 are electrode ends, and the tube walls at the electrode ends of the lamps 120 are not coated with phosphor powders uniformly. Therefore, in the backlight module 100 , areas at the two ends of the lamps 120 may have apparently lower luminance. Even worse, dark areas may be generated on an LCD using the conventional backlight module 100 , which severely influences the display quality of the LCD.
- the present invention is directed to a backlight module with uniform luminance.
- the present invention is also directed to an LCD with good display quality.
- the present invention provides a backlight module including a frame, a lamp stationary barrier, and at least one lamp.
- the lamp stationary barrier is disposed on a base plate of the frame and has at least one side wall.
- the side wall is formed by oblique lines, a first angle is formed between the oblique line adjacent to the base plate and the base plate, and a second angle is formed between every two adjacent oblique lines.
- the lamp is disposed in the frame, and at least a portion of an electrode end of the lamp is covered by the side wall.
- lengths of the oblique lines are not all the same.
- the first angle is in a range of 90° to 180°.
- the second angle is in a range of 90° to 180°.
- the second angles are not all the same.
- a material of the frame includes metal.
- the backlight module further includes a reflector disposed between the base plate and the lamp.
- the backlight module further includes a reflective layer disposed on an inner surface of the base plate and the lamp stationary barrier facing the lamp.
- a material of the reflective layer includes metal or polymer.
- the present invention further provides an LCD which includes a liquid crystal panel and an above-mentioned backlight module.
- the backlight module is disposed beneath the liquid crystal panel.
- the backlight module further includes an optical film disposed between the backlight module and the liquid crystal panel.
- the optical film is a brightness enhancement film, a prism sheet, or a diffuser.
- the present invention further provides a backlight module which includes a frame, a lamp stationary barrier, and at least one lamp.
- the lamp stationary barrier is disposed on a base plate of the frame, and has at least one curved side wall.
- the lamp is disposed in the frame, and at least a portion of an electrode end of the lamp is covered by the curved side wall.
- a material of the frame includes metal.
- the backlight module further includes a reflector disposed between the base plate and the lamp.
- the backlight module further includes a reflective layer disposed on an inner surface of the base plate and the lamp stationary barrier facing the lamp.
- a material of the reflective layer includes metal or polymer.
- the present invention further provides an LCD which includes a liquid crystal panel and an above-mentioned backlight module.
- the backlight module is disposed beneath the liquid crystal panel.
- the backlight module further includes an optical film disposed between the backlight module and the liquid crystal panel.
- the optical film is a brightness enhancement film, a prism sheet, or a diffuser.
- the side wall of the lamp stationary barrier in contact with the lamp is formed by oblique lines or a curve line.
- the side wall may reflect light from other areas in the backlight module to a light-emitting surface above the electrode end of the lamp to output the light. Therefore, the luminance uniformity of the backlight module is improved, and the LCD using the backlight module may achieve to have good display quality.
- FIG. 1 shows a conventional backlight module and a luminance distribution diagram thereof.
- FIG. 2A is a schematic view of a backlight module according to a first embodiment of the present invention.
- FIG. 2B is a cross-sectional view of FIG. 2A .
- FIG. 3 is a schematic view of an LCD using the backlight module of this embodiment.
- FIG. 4 is a schematic view of a backlight module according to a second embodiment of the present invention.
- FIG. 2A is a schematic three-dimensional view of a backlight module according to a first embodiment of the present invention
- FIG. 2B is a cross-sectional view of FIG. 2A
- the backlight module 200 includes a frame 202 , a lamp stationary barrier 210 , and at least one lamp 220 .
- the lamp stationary barrier 210 and the lamp 220 are both disposed in the frame 202 , and located on the base plate 204 of the frame 202 .
- the lamp stationary barrier 210 is used to support the lamp 220 .
- the lamp 220 may be a cold cathode fluorescence lamp (CCFL), and at least one electrode end 222 of the lamp 220 correspondingly contacts the side wall 214 of the lamp stationary barrier 210 . Referring to FIGS. 2A and 2B again, at least a portion of the electrode end 222 is covered by the side wall 214 . Further, the lamp 220 is in a straight- or U-shape.
- CCFL cold cathode fluorescence lamp
- a material of the frame 202 is preferably metal.
- the frame 202 made of metal may also reflect light from the lamp 220 , such that the backlight module 200 has a better light source utilization.
- the frame 202 may be made of plastic.
- a reflective material such as lead paint, may be added in the plastic during the fabrication of the frame 202 .
- the lamp stationary barrier 210 has at least one side wall 214 formed by oblique lines 216 , and lengths of the oblique lines 216 are not all the same. In other words, the lengths of the oblique lines 216 may be totally the same, totally different, or partially the same.
- an angle ⁇ is formed between the oblique line 216 adjacent to the base plate 204 and the base plate 204 , and an angle ⁇ is formed between every two adjacent oblique lines 216 , where 90° ⁇ , ⁇ 180°, and the angle ⁇ is different from the angle ⁇ .
- the lamp 220 when the lamp 220 emits light, part of the light is directly projected out of the backlight module 200 from a light-emitting surface. The rest of the light is first projected on the frame 202 , and then reflected out of the backlight module 200 by the frame 202 .
- the light projected on the base plate 204 is partially reflected to the side wall 214 , and partially directly reflected out of the backlight module 200 .
- Part of the light projected on the side wall 214 is reflected out of the backlight module 200 , and the rest is first reflected to the base plate 204 and then reflected out of the backlight module 200 by the base plate 204 .
- the side wall 214 formed by at least two oblique lines 216 may guide the light from other areas in the backlight module 200 to come out from the electrode end 222 of the lamp 220 .
- the light output from the electrode end 222 of the lamp 220 is increased. Therefore, the brightness at the electrode end 222 of the lamp 220 is effectively improved. In other words, the luminance uniformity of the backlight module 200 will be enhanced accordingly.
- Table 1 shows luminance simulation results of a conventional backlight module, in which the side wall of the conventional backlight module only has one oblique line.
- Table 2 shows luminance simulation results of a backlight module in this embodiment, in which the side wall of the backlight module in this embodiment has two oblique lines.
- the three values in each column respectively represent luminance of three lamps 220 arranged longitudinally in the backlight module 200 .
- the three values in each row from left to right respectively represent luminance of the lamps 220 from their central portions to electrode end 222 .
- the luminance ratio of the backlight module is preferably 1. That is, the brightness of the backlight module must be consistent, without much difference in brightness. Thus, the LCD using the backlight module may have good display quality.
- the side wall 214 formed by two oblique lines 216 can effectively improve the brightness of the area at the electrode end 222 of the lamp 220 , thereby reducing the luminance ratio. That is, the output light distribution of the backlight module 200 is more uniform, and the luminance uniformity is greatly improved.
- the side wall formed by two oblique lines can effectively improve the luminance uniformity of the backlight module.
- the two oblique lines 216 having different lengths are described by way of example.
- Those of ordinary skilled persons in the art may conceivably design the two oblique lines into several oblique lines, and the lengths of the oblique lines are totally the same, totally different, or partially the same, thereby effectively improving the luminance uniformity of the backlight module. It can be deduced from the above simulation results that if the side wall has more oblique lines, the uniform luminance of the backlight module will be improved more effectively.
- the angle ⁇ is different from the angle ⁇ .
- Those of ordinary skilled persons in the art may adjust the angles ⁇ and ⁇ to be the same according to the practical requirements of the backlight module.
- the angles ⁇ formed between every two adjacent oblique lines may be totally the same, different, or partially the same according to the design requirements.
- the backlight module 200 further includes a reflective layer 230 disposed on an inner surface 205 of the base plate 204 to face the lamp 220 and overlapped on the oblique line 216 .
- the reflective layer 230 is made of a metal or a highly-reflective polymer material, so as to effectively reflect the light emitted by the lamp 220 .
- a reflector (not shown) may be disposed between the base plate 204 and the lamp 220 , so as to make the backlight module 200 have a good light source utilization.
- FIG. 3 is a schematic view of an LCD using the backlight module of this embodiment.
- the backlight module 200 is assembled with a liquid crystal panel 300 , and the backlight module 200 is disposed beneath the liquid crystal panel 300 , thus forming an LCD 350 .
- the backlight module 200 can provide light with uniform luminance to the liquid crystal panel 300 , and thus the LCD 350 has good display quality.
- an optical film 310 may be further disposed between the backlight module 200 and the liquid crystal panel 300 .
- the optical film 310 may be a brightness enhancement film for enhancing the brightness of the light, a diffuser for improving the light utilization, or a prism sheet for adjusting the direction of the light.
- FIG. 4 is a schematic view of a backlight module according to a second embodiment of the present invention. Referring to FIGS. 2 and 4 together, this embodiment is substantially similar to the first embodiment, and the same or like symbols appearing in the figures represent same or like elements. The same details will not be described and only the differences therebetween will be illustrated hereinafter.
- the backlight module 400 includes a frame 402 , a lamp stationary barrier 410 , and at least one lamp 420 disposed in the frame 402 .
- the lamp stationary barrier 410 has at least one curved side wall 414 .
- An electrode end 422 of the lamp 420 correspondingly contacts the curved side wall 414 .
- at least a portion of the electrode end 422 is covered by the curved side wall 414 .
- the curved side wall 414 achieves the same function as the side wall 214 formed by the oblique lines 216 in the first embodiment.
- the curved side wall 414 may guide the light from other areas in the backlight module 400 to come out from above the electrode end 422 of the lamp 420 .
- the luminance uniformity of the backlight module 400 is enhanced.
- a reflective layer 430 may be disposed on an inner surface 405 of the frame 402 to face the lamp 420 , and the reflective layer 430 extends to the curved side wall 414 .
- a reflector (not shown) may be disposed between the base plate 404 of the frame 402 and the lamp 420 , so as to improve the light source utilization of the backlight module 400 .
- the backlight module 400 with good luminance uniformity is assembled with a liquid crystal panel (not shown) to form the LCD, and the LCD has a good display effect.
- a liquid crystal panel not shown
- the configuration of the LCD formed by the assembly of the backlight module 400 and the liquid crystal panel has already been illustrated in the first embodiment of FIG. 3 , so the details will not be described with the drawings again.
- the side wall formed by oblique lines or a curve line may be used to guide the light from other areas in the backlight module to come out from the electrode end of the lamp. Therefore, the luminance uniformity of the backlight module is improved, and further the LCD using the backlight module has a good display effect.
Abstract
Description
TABLE 1 |
The side wall is formed by one oblique line, and θ = 105° |
325.1 | 355.9 | 288.3 | MAX | 362.6 |
311.6 | 334.1 | 291.3 | min | 288.3 |
326.6 | 362.6 | 293.5 | Luminance | 1.26 |
ratio | ||||
TABLE 2 |
The side wall is formed by two oblique lines, and θ = 127.5°, φ = 150° |
320.6 | 354.5 | 291.3 | MAX | 358.9 |
317.6 | 337.8 | 294.3 | min | 291.3 |
324.3 | 358.9 | 295.8 | Luminance | 1.23 |
ratio | ||||
Claims (20)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW96122300 | 2007-06-21 | ||
TW96122300A | 2007-06-21 | ||
TW096122300A TWI361308B (en) | 2007-06-21 | 2007-06-21 | Backlight module and liquid crystal display device |
Publications (2)
Publication Number | Publication Date |
---|---|
US20080316390A1 US20080316390A1 (en) | 2008-12-25 |
US7821593B2 true US7821593B2 (en) | 2010-10-26 |
Family
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Application Number | Title | Priority Date | Filing Date |
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US12/142,741 Active 2029-01-01 US7821593B2 (en) | 2007-06-21 | 2008-06-19 | Blacklight module and liquid crystal display |
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US (1) | US7821593B2 (en) |
TW (1) | TWI361308B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10310327B2 (en) | 2015-03-20 | 2019-06-04 | Au Optronics Corporation | Backlight module having brightness enhancement design at periphery of display surface |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130141663A1 (en) * | 2011-12-02 | 2013-06-06 | Poshen Lin | Liquid Crystal Display and Making Method Thereof |
WO2014137032A1 (en) | 2013-03-08 | 2014-09-12 | Lg Electronics Inc. | Display device |
CN104359051A (en) * | 2014-11-10 | 2015-02-18 | 京东方科技集团股份有限公司 | Backlight module and display device |
US10761372B2 (en) * | 2017-02-09 | 2020-09-01 | Panasonic Intellectual Property Management Co., Ltd. | Image display apparatus |
CN107329321A (en) * | 2017-08-15 | 2017-11-07 | 青岛海信电器股份有限公司 | A kind of down straight aphototropism mode set and display device |
CN108037612A (en) * | 2017-11-30 | 2018-05-15 | 青岛海信电器股份有限公司 | Liquid crystal display device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7246934B2 (en) * | 2004-04-29 | 2007-07-24 | Lg.Philips Lcd Co., Ltd. | Backlight unit |
US7452102B2 (en) * | 2005-08-08 | 2008-11-18 | Samsung Electronics Co., Ltd. | Lamp holder, lamp assembly having the same, backlight assembly having the same and display device having the same |
-
2007
- 2007-06-21 TW TW096122300A patent/TWI361308B/en not_active IP Right Cessation
-
2008
- 2008-06-19 US US12/142,741 patent/US7821593B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7246934B2 (en) * | 2004-04-29 | 2007-07-24 | Lg.Philips Lcd Co., Ltd. | Backlight unit |
US7452102B2 (en) * | 2005-08-08 | 2008-11-18 | Samsung Electronics Co., Ltd. | Lamp holder, lamp assembly having the same, backlight assembly having the same and display device having the same |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10310327B2 (en) | 2015-03-20 | 2019-06-04 | Au Optronics Corporation | Backlight module having brightness enhancement design at periphery of display surface |
Also Published As
Publication number | Publication date |
---|---|
US20080316390A1 (en) | 2008-12-25 |
TW200900794A (en) | 2009-01-01 |
TWI361308B (en) | 2012-04-01 |
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